TUNE2FS(8) (NAME) tune2fs - ext2/ext3/ext4 (SYNOPSIS) tune2fs [ ] (DESCRIPTION) tune2fs ext2 ext3 ext4 . -l tune2fs(8) dumpe2fs(8) . ( /dev/sda1) (UUID) : "LABEL=volume-label" "UUID=uuid" ( LABEL=home UUID=e40486c6-84d5-4f2f-b99c-032281799c9d). (OPTIONS) -c max-mount-counts (mount) e2fsck(8) . max-mount-counts "random" tune2fs . max-mount-counts 0 -1 e2fsck(8) . . e2fsck . e2scrub(8) . LVM . -C mount-count . max-mount-counts -c e2fsck(8) . -e error-behavior . e2fsck(8) . error-behavior : continue . remount-ro . panic (kernel panic). -E extended-options . ('=') . : clear_mmp MMP ( ) . fsck . -f . encoding=encoding-name casefold encoding-name . encoding-name utf8 . casefold . encoding_flags=encoding-flags . . encoding-flags . casefold . strict . strict . force_fsck . fsck . hash_alg=hash-alg -B (hashed b- tree). : legacy half_md4 tea. mmp_update_interval=interval MMP interval . 0 interval . . mmp . mount_opts=mount_option_string . -o mount_option_string . ext4 mount_option_string mount(8) . 2.6.35 ext2 ext3 . orphan_file_size=size (truncate) . . stride=stride-size RAID stride-size . . mke2fs(2) . . stripe_width=stripe-width RAID stripe-width (stripe). stride-size * N N RAID ( RAID 5 N+1 RAID 6 N+2). -- RAID . test_fs ext4dev . ^test_fs test_fs . -f tune2fs . has_journal ( ) . -f . : . -g group . group (gid) . gid . -i interval-between-checks[d|m|w] . d interval-between-checks m w . . -c ( ) . -I . e2fsck(8) . . . . . -j ext3 . -J ( ) . ext3 . .journal . ext3 (immutable) . e2fsck(8) .journal . . e2fsck(8) (rescue floppy) . (initrd) initrd ext2 ext3 /etc/fstab ext3 ext3 . -J journal-options ext3. ('=') . : device=external-journal external-journal. mke2fs -O journal_dev external-journal . external-journal . e2fsck(8) . external-journal LABEL=label UUID=UUID ext2 . dumpe2fs(8) . -L tune2fs(8) . fast_commit_size=fast-commit-size (fast commit) fast-commit-size . fast_commit . fast_commit journal-size . fast_commit journal-size + ( fast-commit-size * 1024) . ,, ( ) . location=journal-location . journal-location ( 'M' 'G') . size=journal-size journal-size . ( ) ,, . . size device . -l . -L volume-label . ext2 volume-label tune2fs . tune2fs volume-label . mount(8) fsck(8) /etc/fstab(5) ( ) LABEL=volume-label /dev/hda5 . -m reserved-blocks-percentage . syslogd(8) . . -M last-mounted-directory . -o [^]mount-option[,...] . /etc/fstab(5) mount(8) . 2.4.20 . . ('^') ('+') . tune2fs : debug . bsdgroups BSD : (gid) . System V fsgid setgid gid setgid . user_xattr . acl (Posix Access Control Lists). uid16 UID GID. . journal_data ( ) (commit) . journal_data_ordered . journal_data_writeback . . nobarrier (barrier) . ( ext4 2.6.35 .) block_validity block_validity . . . ( ext4 2.6.35 .) discard discard . trim/discard ( SSD thin-provisioned) . ( ext4 2.6.35 .) nodelalloc nodelalloc . (delayed allocation) . ( ext4 2.6.35 .) -O [^]feature[,...] () . . ('^') ('+') . ext4(5) . tune2fs : 64bit 2^32 . casefold (casefolding) . F . dir_index B . dir_nlink . ea_inode . Tune2fs . encrypt . Tune2fs . extent (extent trees) . Tune2fs . extra_isize ext4 . filetype . flex_bg . Tune2fs mke2fs(8) flex_bg . has_journal . -j . fast_commit fsync . large_dir . Tune2fs . huge_file . large_file (GiB) . metadata_csum . metadata_csum_seed (seed) UUID metadata_csum . mmp (MMP). orphan_file . project (project ID) . . quota . read-only . resize_inode . Tune2fs . sparse_super . Tune2fs . stable_inodes UUID UUID . Tune2fs . uninit_bg e2fsck(8). e2fsck e2fsck . verity verity . Tune2fs . sparse_super uninit_bg filetype resize_inode e2fsck(8) . Tune2fs e2fsck(8) . dir_index e2fsck -D -B . . uninit_bg flex_bg ext4 . -r reserved-blocks-count . -Q quota-options 'quota' . : [^]usrquota / . [^]grpquota / . [^]prjquota / . -T time-last-checked e2fsck. () . (LVM) (snapshot) . . time-last-checked YYYYMMDD[HH[MM[SS]]]. now . -u user . user uid . uid . -U UUID (UUID) UUID. UUID : "c1b9d5a2-f162-11cf-9ece-0020afc76f16". UUID : clear UUID random UUID time UUID UUID mount(8) fsck(8) /etc/fstab(5) ( ) UUID=uuid /dev/hda1 . uuidgen(8) . /dev/random /dev/urandom tune2fs UUID UUID . -z undo_file (undo file) . e2undo(8) . undo_file tune2fs-device.e2undo E2FSPROGS_UNDO_DIR . : . (BUGS) . ... (AUTHORS) tune2fs Remy Card . Theodore Ts'o . tune2fs ext2fs Theodore Ts'o . Christian Kuhtz . Uwe Ohse . (AVAILABILITY) tune2fs e2fsprogs . (SEE ALSO) debugfs(8), dumpe2fs(8), e2fsck(8), mke2fs(8), ext4(5) e2fsprogs TUNE2FS(8)